/backup list empty

[HannesGitH]

I have installed fastback via nix-minecraft (compare Infinidoge/nix-minecraft#50), and backing up seems to work fine:
/backup info:

FastBack Info
-------------FastBack version: 0.15.6+1.20.1-fabricnative git installed: true   git: git version 2.44.1   git-lfs: git-lfs/3.5.1 (3.5.1; linux amd64; go 1.22.3)Backup UUID: ata3World size: 157 MBLocal backup size: 417 MBbackup-enabled = trueremote-url = file:///tmp/create2backuprestore-directory = nullnative-git-enabled = falseautoback-wait = 0mods-backup-enabled = falsebroadcast-enabled = truebroadcast-message = nullShutdown action: localAutoback action: noneNo snapshot retention policy set.No remote snapshot retention policy set.

and doing git reflog inside a copied world results in:

143da42 (HEAD -> ata3/2024-06-13_02-52-40) HEAD@{0}: commit (initial): ata3/2024-06-13_02-52-40
ff295d9 (ata3/2024-06-13_02-50-32) HEAD@{2}: commit (initial): ata3/2024-06-13_02-50-32
b689d0c (ata3/2024-06-13_02-47-44) HEAD@{4}: commit (initial): ata3/2024-06-13_02-47-44
22b2f2d (ata3/2024-06-13_02-46-41) HEAD@{6}: commit (initial): ata3/2024-06-13_02-46-41
c67b26d (ata3/2024-06-12_22-47-52) HEAD@{8}: commit (initial): ata3/2024-06-12_22-47-52
0f55b62 (ata3/2024-06-12_22-04-06) HEAD@{10}: commit (initial): ata3/2024-06-12_22-04-06
93017c7 (ata3/2024-06-12_14-20-16) HEAD@{12}: commit (initial): ata3/2024-06-12_14-20-16
afa27d3 (ata3/2024-06-12_03-17-18) HEAD@{14}: commit (initial): ata3/2024-06-12_03-17-18
321135f (ata3/2024-06-12_03-06-26) HEAD@{16}: commit (initial): ata3/2024-06-12_03-06-26
cf52693 (ata3/2024-06-12_02-51-43) HEAD@{18}: commit (initial): ata3/2024-06-12_02-51-43
baec338 (ata3/2024-06-12_02-49-26) HEAD@{20}: commit (initial): ata3/2024-06-12_02-49-26
85021ad (ata3/2024-06-12_02-47-28) HEAD@{22}: commit (initial): ata3/2024-06-12_02-47-28
df02bbf (ata3/2024-06-12_01-20-11) HEAD@{24}: commit (initial): ata3/2024-06-12_01-20-11
f41dbdd (ata3/2024-06-12_00-40-41) HEAD@{26}: commit (initial): ata3/2024-06-12_00-40-41

which i guess is working fine..
but /backup list stays empty